A lemon mug cake in a floral cup, topped with a raspberry. A whole lemon and some raspberries are in the background.
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Keto Raspberry Mug Cake

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Craving something sweet but don’t want to derail your low-carb lifestyle? This keto raspberry mug cake is the perfect quick and easy dessert. Made with simple ingredients, this fluffy and flavorful cake is ready in minutes, making it ideal for those moments when you need a guilt-free treat. The tartness of fresh raspberries pairs beautifully with the subtle sweetness of the cake, while the hint of lemon zest adds a refreshing brightness. Plus, since it’s made in a mug, there’s no need for complicated prep or cleanup—just mix, microwave, and enjoy!

A lemon mug cake with a raspberry on top is in a floral-patterned mug. A lemon and some raspberries are scattered nearby on a textured surface.

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Coconut Flour in Mug Cakes

Coconut flour works well in keto and paleo mug cakes, especially when paired with ingredients like eggs, butter and a touch of acidity (like lemon juice) to balance its slight natural sweetness.

Ingredients

Grab these ingredients and get ready to make your mug cake!

Image showing labeled ingredients on a marble surface: coconut flour, melted butter, an egg, baking powder, lemon zest, lemon juice, and raspberries.
  • Coconut Flour – A low-carb, high-fiber flour that keeps the cake light and slightly moist. It absorbs liquid well, so a little goes a long way.
  • Egg – Acts as a binding agent and gives the cake a soft, airy texture.
  • Sweetener – Adds sweetness without the carbs; options like allulose or monk fruit work best.
  • Raspberries – Provide natural tartness and a pop of color, along with antioxidants and fiber.
  • Baking Powder – Helps the cake rise, making it fluffy rather than dense.
  • Butter – Adds richness and moisture to the cake. Coconut oil can be substituted to make this dairy free.
  • Lemon Zest – Enhances the flavor with a bright, citrusy note.
  • Lemon Juice – Adds a bit of acidity to balance the sweetness and deepen the raspberry flavor.

How To Make Keto Raspberry Mug Cake

White mug filled with yellow liquid sits on a marbled surface.

Beat the wet ingredients together.

White mug with a dry yellow cake mix clumped over melted butter, placed on a marble countertop.

Add the flour and baking powder.

A mug with a baked cake topped with raspberries on a marble surface.

Stir in the raspberries.

Lemon mug cake in a floral cup with a raspberry on top. A whole lemon and scattered raspberries are placed nearby on a gray surface.

Microwave and serve!

Recipe Tips

  • Choose the right sweetener – Use a keto-friendly sweetener like erythritol, monk fruit, or allulose for the best taste and texture.
  • Don’t overmix – Stir until just combined to keep the cake light and fluffy.
  • Microwave time may vary – Depending on your microwave’s wattage, your cake may take anywhere from 60 to 90 seconds to cook. Start with 60 seconds and add more time if needed.
  • Use fresh or frozen raspberries – If using frozen raspberries, don’t thaw them beforehand to prevent excess moisture in the cake.
  • Enhance the flavor – A dash of vanilla extract or a sprinkle of cinnamon can add extra depth to the flavor.
A small raspberry dessert topped with whipped cream and a raspberry on a blue plate. A lemon and additional raspberries are in the background.

More Keto Mug Cake Recipes

Enjoy a small dessert with these other low carb mug cake recipes:

Almond Flour Chocolate Mug Cake

Keto Chocolate Peanut Butter Mug Cake

Red Velvet Protein Mug Cake

A lemon mug cake in a floral cup, topped with a raspberry. A whole lemon and some raspberries are in the background.

Keto Raspberry Mug Cake

This Keto Raspberry Mug Cake is a quick and delicious low-carb treat that’s ready in just minutes! Made with coconut flour, fresh raspberries, and a hint of lemon, this single-serve dessert is soft, fluffy, and bursting with flavor.
Prep Time 3 minutes
Cook Time 2 minutes
Total Time 5 minutes
Course Dessert
Cuisine gluten free, keto
Servings 1 serving
Calories 239 kcal

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Ingredients
 
 

  • 2 tablespoons coconut flour
  • 1 large egg
  • 1 tablespoon monk fruit sweetener or other sweetener
  • 1 teaspoon baking powder
  • 1 tablespoon butter, melted
  • 1/2 teaspoon lemon zest
  • 1 teaspoon lemon juice
  • 4-5 raspberries

Instructions
 

  • In a microwave-safe mug, add the melted butter, egg and lemon juice. Mix well.
  • Add the coconut flour, baking powder and lemon zest. Stir until well combined.
  • Gently fold in the raspberries, slightly mashing them for a burst of flavor throughout the cake
  • Microwave on high for 60–90 seconds, or until the cake is set and fluffy.
  • Let it cool for a minute before enjoying!

Notes

Makes 1 serving.

Nutrition

Serving: 1servingCalories: 239kcalCarbohydrates: 11gProtein: 9gFat: 18gFiber: 6gNet Carbs: 5g

The information shown is an estimate provided by an online nutrition calculator.

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